[MARMAM] New publication - Decadal changes in blood δ13C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands

Julie Mestre j.mestre at hotmail.fr
Mon Sep 14 13:08:00 PDT 2020

Dear MARMAM community,

My co-authors and I are pleased to announce the publication of a new paper titled Decadal changes in blood ¦Ä13C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands

Mestre, J., Authier, M., Cherel, Y., Harcourt, R., McMahon, C.R., Hindell, M.A., Charrassin, J.-B., Guinet C. 2020. Decadal changes in blood ¦Ä13C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands. Proceedings of the Royal Society B. 287: 2020154. https://doi.org/10.1098/rspb.2020.1544<https://webmail.cnrs.fr/owa/redir.aspx?C=Gn7Ur2Ql5F0bNW_irvxlWfR8k7dtCDny8r5HbmACdEJlZyMg7knYCA..&URL=https%3a%2f%2fdoi.org%2f10.1098%2frspb.2020.1544>


Changes in the foraging environment and at-sea distribution of southern elephant seals from Kerguelen Islands were investigated over a decade (2004¨C2018) using tracking, weaning mass, and blood ¦Ä13C values. Females showed either a sub-Antarctic or an Antarctic foraging strategy, and no significant shift in their at-sea distribution was detected between 2004 and 2017. The proportion of females foraging in sub-Antarctic versus Antarctic habitats did not change over the 2006¨C2018 period. Pup weaning mass varied according to the foraging habitat of their mothers. The weaning mass of sub-Antarctic foraging mothers' pups decreased by 11.7 kg over the study period, but they were on average 5.8 kg heavier than pups from Antarctic foraging mothers. Pup blood ¦Ä13C values decreased by 1.1¡ë over the study period regardless of their sex and the presumed foraging habitat of their mothers. Together, these results suggest an ecological change is occurring within the Indian sector of the Southern Ocean with possible consequences on the foraging performance of southern elephant seals. We hypothesize that this shift in ¦Ä13C is related to a change in primary production and/or in the composition of phytoplankton communities, but this requires further multidisciplinary investigations.

The paper can be found here: https://doi.org/10.1098/rspb.2020.1544<https://webmail.cnrs.fr/owa/redir.aspx?C=Gn7Ur2Ql5F0bNW_irvxlWfR8k7dtCDny8r5HbmACdEJlZyMg7knYCA..&URL=https%3a%2f%2fdoi.org%2f10.1098%2frspb.2020.1544> or email me for any question.

Best regards,

Julie Mestre


Julie Mestre

PhD student

julie.mestre at cebc.cnrs.fr<https://webmail.cnrs.fr/owa/redir.aspx?C=RHXSuanXpbHLBmqM4Ho_jb4f90w1Sbiu_-CUosZQ4I9lZyMg7knYCA..&URL=mailto%3ajulie.mestre%40cebc.cnrs.fr>; j.mestre at hotmail.fr<https://webmail.cnrs.fr/owa/redir.aspx?C=P5sEwP0VaTfgC_zru3hS8i5lBxcY4JSkT6Ao5KX-AvplZyMg7knYCA..&URL=mailto%3aj.mestre%40hotmail.fr>

Centre d¡¯Etudes Biologiques de Chiz¨¦ (CEBC)

CNRS UMR 7372 ¨C Universit¨¦ de La Rochelle

405 Route de la Canauderie

79360 Villiers-en-Bois




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